A5087306621- Origins and Evolution of Life
- Protein Structure and Dynamics
- Machine Learning in Bioinformatics
- Molecular spectroscopy and chirality
- RNA and protein synthesis mechanisms
- Photoreceptor and optogenetics research
- Spectroscopy and Quantum Chemical Studies
- Nonlinear Dynamics and Pattern Formation
- Antimicrobial Peptides and Activities
- vaccines and immunoinformatics approaches
- Chemical Synthesis and Analysis
- Surfactants and Colloidal Systems
- Astro and Planetary Science
- Bacteriophages and microbial interactions
- Influenza Virus Research Studies
- Crystallization and Solubility Studies
- Supramolecular Self-Assembly in Materials
- Molecular Spectroscopy and Structure
- Emergency and Acute Care Studies
- Analytical Chemistry and Chromatography
- Viral Infections and Outbreaks Research
- Photosynthetic Processes and Mechanisms
- Advanced Chemical Physics Studies
- COVID-19 epidemiological studies
- Advanced Thermodynamics and Statistical Mechanics
Universidad Autónoma del Estado de Morelos
2016-2025
Universidad Nacional Autónoma de México
2019
Instituto Politécnico Nacional
2019
CIUDAD
2004-2018
Synchrotron soleil
2017
Universidad Autónoma del Estado de México
2004-2012
Université Toulouse III - Paul Sabatier
1997-2005
Softmat - Chimie des colloïdes, polymères & assemblages complexes
1997-2005
Centre National de la Recherche Scientifique
1997-2004
Wake Forest University
1999
Making ribose in interstellar ices Astrobiologists have long speculated on the origin of prebiotic molecules such as amino acids and sugars. Meinert et al. demonstrated that numerous can be formed an interstellar-analog sample containing a mixture simple water, methanol, ammonia. They irradiated with ultraviolet light under conditions similar to those expected during formation solar system. This yielded wide variety sugars, including ribose—a major constituent ribonucleic acid (RNA). Science...
Significance In molecular clouds out of which stars and planetary systems form, simple solid-state molecules made in large part H 2 O, CO, CO , CH 3 OH, NH are abundantly present. these environments, energetic thermal processes on ices, can be simulated the laboratory, lead to complex organic matter. Possibly at origin matter our Solar System incorporated into planetesimals, this material may considered as a potential source for prebiotic chemistry telluric planets, following process that...
Kinetic modeling using nonlinear differential equations is proposed to analyze the spontaneous generation of enantiomeric excess in autocatalytic addition diisopropylzinc prochiral pyrimidine carbaldehydes (Soai reaction). Our approach reproduces experimentally observed giant chiral amplification from an initial <10 –6 % >60%, high sensitivity and positive response presence minute amounts initiator at concentrations –14 M, absolute asymmetric synthesis achiral starting conditions. From...
Background: Since the 1980s, public health, society, and global economy have been severely impacted by HIV/AIDS, resulting in countless deaths weakened health systems worldwide. Exclusion unemployment caused social stigma, while economic consequences, including reduced labor productivity increased healthcare costs, observed, particularly regions with fragile systems. Objective: Computational studies were conducted to characterize HIV/AIDS envelope glycoproteins differentiate them from other...
Background: The Lassa virus has been endemic throughout Africa since the 1960s. It is causative agent of fever, which annually impacts between 100,000 and 300,000 individuals, predominantly in West Africa, leading to over 5,000 deaths. Infected rodents transmit disease, when they come into contact with contaminated food or goods. overall mortality rate approximately 1%, but it increases 15% severe cases. Pregnant women their third trimester are especially vulnerable condition, a higher risk...
In this work, we experimentally investigate the narrow escape problem using self-propelled camphor-infused discs, which have possibility to from a bounded circular domain through an opening in boundary. To analyze statistical properties of problem, proposed two experimental protocols: first, control setup within closed where disc encounters target simulating on boundary, and second real is placed boundary domain. These setups allow us compare how differ between simulated (or fictitious)...
Small added noise has been predicted to direct certain classes of chemical systems towards a specific enantiomeric direction, with the dependence product asymmetry on levels being non-monotonic and nonlinear. Associating selection in such reactions different outputs, varying encode inputs, we observe that response system mirrors input-output relations fundamental logic operations. So complex enantioselection, under influence noise, allows effectively behave as gate. This observation may have...
A comprehensive kinetic analysis of three prototypical autocatalytic cycle models based on the absolute asymmetric Soai reaction is presented. The models, which can give rise to amplification enantiomeric excess and mirror-image symmetry breaking, vary by their monomeric, dimeric or trimeric order assumed catalytic species. Our numerical approach considered entire chiral combinatorics diastereomeric interactions in as well multiplicity coupled reversible reactions without applying fast...
The oscillatory picric acid/CTAB two-phase systemas introduced by Yoshikawa and Matsubara [J. Am. Chem. Soc. 1984, 106, 4423−4427]has been revisited. UV−vis spectroscopic studies were presented that provide a clearer new insight into the possible kinetic mechanism for behavior. It was shown key process in system is formation of 1:1 ion pairs between picrate CTA+ at liquid/liquid interface desorb move organic phase. Kinetic experiments also showed presence alcoholwhich essential to observe...
Chiral symmetry breaking in stirred crystallization of sodium chlorate ( ${\mathrm{NaClO}}_{3}$) occurs via the production secondary crystals from a single ``mother crystal.'' Martin, Tharrington, and Wu [Phys. Rev. Lett. 77, 2826 (1996)] investigated this phenomenon concluded that it was mechanical crushing crystal by stir bar, not convection, produces crystal. Here we report generation when saturated solution is simply made to flow over bromate ${\mathrm{NaBrO}}_{3}$) This clearly shows...
Abstract Nonlinear effects in asymmetric synthesis are identified by a nonlinear relationship between the enantiomeric excess of product versus that chiral catalyst. Such information is not always sufficient to reveal if active catalyst acts its monomeric or dimeric form. Numerical simulations two kinetic models including monomer and dimer catalysis with Michaelis–Menten‐type reaction mechanism suggest mainly sensitive an analogue Michaelis–Menten constant as well diastereomeric energy...
The biphasic alkaline hydrolysis of ethyl caprylate (EC) exhibits highly nonlinear kinetics that has been attributed in the literature to "micellar autocatalysis" (Bachmann, P. A. et al. Nature 1992, 357, 57). New experimental results enable us establish a macroscopic kinetic model quantitatively accounting for dynamics this reaction. According model, EC is carried from organic aqueous phase by transient micelle−EC complex (MEC). Curve fitting data inverse treatment shows formation MEC more...
Oscillations of the electric potential and interfacial tension were simultaneously recorded in a water−oil−water system (cetyltrimethylammonium bromide (CTAB) water/picric acid dichloromethane/water). Both types oscillations perfectly correlated time shape. In each oscillatory cycle, fast jumps are related to rapid adsorption surfactant at interface while slow motion relaxations correspond liberation from by formation hydrophobic cetyltrimethylammonium picrate ion pairs that diffuse into...
Numerical kinetic simulations have been employed to understand the origin of enantioselectivity reversal chiral beta-amino alcohol catalysts occurring in presence their achiral analogs autocatalytic addition diisopropylzinc pyrimidine carbaldehydes (Soai reaction). In a preceding work (Rivera Islas, J.; Lavabre, D.; Grevy, J. M.; HernAndez Lamoneda, R.; Rojas Cabrera, H.; Micheau, C.; Buhse, T. Proc. Natl. Acad. Sci. U.S.A. 2005, 102, 13743-13748), we provided possible explanation for...
Do it yourself: An autocatalytic cycle network is introduced to accurately reproduce the unprecedented features of Soai reaction such as huge asymmetric autoamplification and spontaneous mirror-symmetry breaking. In contrast previous attempts, which were based on formal kinetics, present mechanism involves interconnected realistic structures including dimers, trimers tetramers resembles stereoselective template-directed self-replication (see picture).
In the recent decades, antibacterial peptides have occupied a strategic position for pharmaceutical drug applications and became subject of intense research activities since they are used to strengthen immune system all living organisms by protecting them from pathogenic bacteria. This work proposes simple easy statistical/computational method through peptide polarity index measure which an subgroup can be efficiently identified, that is, characterized high toxicity bacterial membranes but...
Abstract A kinetic and thermodynamic model of the Soai reaction is presented. This allows quantitative determination five rates constants one equilibrium constant. The realistic as it integrates results most recently published XRD structural data DFT calculations selected experimental data. Equipped with extracted parameters from numerical fitting time evolution both substrate concentration enantiomeric excess, was able to mimic strong asymmetric amplification extremely low initial excess...
A severe respiratory disease epidemic outbreak correlates with a high demand of specific supplies and specialized personnel to hold it back in wide region or set regions; these would be beds, storage areas, hemodynamic monitors, mechanical ventilators, as well physicians, technicians, nurses. We describe an online cumulative sum based model named Overcrowd-Severe-Respiratory-Disease-Index on the Modified Overcrowd Index that simultaneously monitors informs those healthcare network generating...
The regulatory systems controlling expression of the ctxAB genes encoding cholera toxin (CT) in classical and El Tor biotypes pathogenic Vibrio cholerae have been characterized found to be almost identical. Notwithstanding this, special vitro conditions, called AKI are required for bacteria produce CT. conditions involve biphasic cultures. In phase 1 organism is grown a still tube 4 h. 2 medium poured into flask continue growth with shaking. Virtually no CT occurs if this protocol not...